style: refactor UI to a minimalist design system using monochromatic black-and-white theme

web/tailwind.config.cjs

@@ -7,8 +7,8 @@ module.exports = {
     extend: {
       colors: {
         amber: colors.amber,
-        slate: colors.slate,
-        indigo: colors.indigo,
+        slate: colors.zinc,
+        indigo: colors.black, // Solid black for the simplest look
         violet: colors.violet,
         emerald: colors.emerald,
       },